blob: 6403ff002b351ece14c933f7b0398e89cc54eb3f [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include "base/compiler_specific.h"
#include "base/component_export.h"
#include "base/containers/flat_map.h"
#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/no_destructor.h"
#include "base/process/process.h"
#include "base/strings/string16.h"
#include "base/synchronization/lock.h"
#include "base/threading/platform_thread.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "ui/base/clipboard/clipboard_format_type.h"
#include "ui/base/clipboard/clipboard_types.h"
class SkBitmap;
namespace ui {
class TestClipboard;
class ScopedClipboardWriter;
class COMPONENT_EXPORT(BASE_CLIPBOARD) Clipboard : public base::ThreadChecker {
static bool IsSupportedClipboardType(ClipboardType type) {
switch (type) {
case ClipboardType::kCopyPaste:
return true;
case ClipboardType::kSelection:
#if !defined(OS_WIN) && !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
return true;
return false;
case ClipboardType::kDrag:
return false;
// Sets the list of threads that are allowed to access the clipboard.
static void SetAllowedThreads(
const std::vector<base::PlatformThreadId>& allowed_threads);
// Sets the clipboard for the current thread. Previously, there was only
// one clipboard implementation on a platform; now that mus exists, during
// mus app startup, we need to specifically initialize mus instead of the
// current platform clipboard. We take ownership of |platform_clipboard|.
static void SetClipboardForCurrentThread(
std::unique_ptr<Clipboard> platform_clipboard);
// Returns the clipboard object for the current thread.
// Most implementations will have at most one clipboard which will live on
// the main UI thread, but Windows has tricky semantics where there have to
// be two clipboards: one that lives on the UI thread and one that lives on
// the IO thread.
static Clipboard* GetForCurrentThread();
// Removes and transfers ownership of the current thread's clipboard to the
// caller. If the clipboard was never initialized, returns nullptr.
static std::unique_ptr<Clipboard> TakeForCurrentThread();
// Does any work necessary prior to Chrome shutdown for the current thread.
// All platforms but Windows have a single clipboard shared accross all
// threads. This function is a no-op on Windows. On Desktop Linux, if Chrome
// has ownership of the clipboard selection this function transfers the
// clipboard selection to the clipboard manager.
static void OnPreShutdownForCurrentThread();
// Destroys the clipboard for the current thread. Usually, this will clean up
// all clipboards, except on Windows. (Previous code leaks the IO thread
// clipboard, so it shouldn't be a problem.)
static void DestroyClipboardForCurrentThread();
virtual void OnPreShutdown() = 0;
// Returns a sequence number which uniquely identifies clipboard state.
// This can be used to version the data on the clipboard and determine
// whether it has changed.
virtual uint64_t GetSequenceNumber(ClipboardType type) const = 0;
// Tests whether the clipboard contains a certain format
virtual bool IsFormatAvailable(const ClipboardFormatType& format,
ClipboardType type) const = 0;
// Clear the clipboard data.
virtual void Clear(ClipboardType type) = 0;
virtual void ReadAvailableTypes(ClipboardType type,
std::vector<base::string16>* types,
bool* contains_filenames) const = 0;
// Reads Unicode text from the clipboard, if available.
virtual void ReadText(ClipboardType type, base::string16* result) const = 0;
// Reads ASCII text from the clipboard, if available.
virtual void ReadAsciiText(ClipboardType type, std::string* result) const = 0;
// Reads HTML from the clipboard, if available. If the HTML fragment requires
// context to parse, |fragment_start| and |fragment_end| are indexes into
// markup indicating the beginning and end of the actual fragment. Otherwise,
// they will contain 0 and markup->size().
virtual void ReadHTML(ClipboardType type,
base::string16* markup,
std::string* src_url,
uint32_t* fragment_start,
uint32_t* fragment_end) const = 0;
// Reads RTF from the clipboard, if available. Stores the result as a byte
// vector.
virtual void ReadRTF(ClipboardType type, std::string* result) const = 0;
// Reads an image from the clipboard, if available.
virtual SkBitmap ReadImage(ClipboardType type) const = 0;
virtual void ReadCustomData(ClipboardType clipboard_type,
const base::string16& type,
base::string16* result) const = 0;
// Reads a bookmark from the clipboard, if available.
// |title| or |url| may be null.
virtual void ReadBookmark(base::string16* title, std::string* url) const = 0;
// Reads raw data from the clipboard with the given format type. Stores result
// as a byte vector.
virtual void ReadData(const ClipboardFormatType& format,
std::string* result) const = 0;
// Returns an estimate of the time the clipboard was last updated. If the
// time is unknown, returns Time::Time().
virtual base::Time GetLastModifiedTime() const;
// Resets the clipboard last modified time to Time::Time().
virtual void ClearLastModifiedTime();
static Clipboard* Create();
Clipboard() = default;
virtual ~Clipboard() = default;
// ObjectType designates the type of data to be stored in the clipboard. This
// designation is shared across all OSes. The system-specific designation
// is defined by ClipboardFormatType. A single ObjectType might be represented
// by several system-specific ClipboardFormatTypes. For example, on Linux the
// CBF_TEXT ObjectType maps to "text/plain", "STRING", and several other
// formats. On windows it maps to CF_UNICODETEXT.
// The order below is the order in which data will be written to the
// clipboard, so more specific types must be listed before less specific
// types. For example, placing an image on the clipboard might cause the
// clipboard to contain a bitmap, HTML markup representing the image, a URL to
// the image, and the image's alt text. Having the types follow this order
// maximizes the amount of data that can be extracted by various programs.
enum ObjectType {
CBF_SMBITMAP, // Bitmap from shared memory.
CBF_DATA, // Arbitrary block of bytes.
// ObjectMap is a map from ObjectType to associated data.
// The data is organized differently for each ObjectType. The following
// table summarizes what kind of data is stored for each key.
// * indicates an optional argument.
// Key Arguments Type
// -------------------------------------
// CBF_SMBITMAP bitmap A pointer to a SkBitmap. The caller must ensure
// the SkBitmap remains live for the duration of
// the WriteObjects call.
// CBF_HTML html char array
// url* char array
// CBF_RTF data byte array
// CBF_BOOKMARK html char array
// url char array
// CBF_TEXT text char array
// CBF_WEBKIT none empty vector
// CBF_DATA format char array
// data byte array
using ObjectMapParam = std::vector<char>;
using ObjectMapParams = std::vector<ObjectMapParam>;
using ObjectMap = base::flat_map<int /* ObjectType */, ObjectMapParams>;
// Write a bunch of objects to the system clipboard. Copies are made of the
// contents of |objects|.
virtual void WriteObjects(ClipboardType type, const ObjectMap& objects) = 0;
void DispatchObject(ObjectType type, const ObjectMapParams& params);
virtual void WriteText(const char* text_data, size_t text_len) = 0;
virtual void WriteHTML(const char* markup_data,
size_t markup_len,
const char* url_data,
size_t url_len) = 0;
virtual void WriteRTF(const char* rtf_data, size_t data_len) = 0;
virtual void WriteBookmark(const char* title_data,
size_t title_len,
const char* url_data,
size_t url_len) = 0;
virtual void WriteWebSmartPaste() = 0;
virtual void WriteBitmap(const SkBitmap& bitmap) = 0;
virtual void WriteData(const ClipboardFormatType& format,
const char* data_data,
size_t data_len) = 0;
// For access to WriteObjects().
friend class ForwardingTestingClipboard;
friend class ScopedClipboardWriter;
friend class TestClipboard;
// For SetClipboardForCurrentThread's argument.
friend struct std::default_delete<Clipboard>;
static base::PlatformThreadId GetAndValidateThreadID();
// A list of allowed threads. By default, this is empty and no thread checking
// is done (in the unit test case), but a user (like content) can set which
// threads are allowed to call this method.
using AllowedThreadsVector = std::vector<base::PlatformThreadId>;
static base::LazyInstance<AllowedThreadsVector>::DestructorAtExit
// Mapping from threads to clipboard objects.
using ClipboardMap =
base::flat_map<base::PlatformThreadId, std::unique_ptr<Clipboard>>;
static base::LazyInstance<ClipboardMap>::DestructorAtExit clipboard_map_;
// Mutex that controls access to |g_clipboard_map|.
static base::LazyInstance<base::Lock>::Leaky clipboard_map_lock_;
} // namespace ui